Furnace



Nov. 1, 1932.

| VSTEINMULLER FURNACE Filed June 29, 1928 2 Sheets-Sheet 1 Jaye/22]: J1." Jarea/Zlikzxmlier I Nov; 1, 1932.

L. STEINMULLER FURNACE Filed June 29, 1928 uuuuuuuuu uuuuuu g 2 Sheets-Sheet. 2

Jaye/Z201? Patented News l, 1932 2: as seen, or set or a;

an emtr, nssrerren so shes/en r EWAGE Application riled done 29, 19%,, derial 22555 189, and in Germany seer-nary 2928.

As ininclined and stepped grates the spa: citic cficiency decreases with the length, as separate so-celled ante-ate has been need on web a portion of the total fuel has been burnt.

According to the present invention the ar rengement is such that the parts, which leave the ante-grate, pass on to the second inclined Ell grate in an incandescent or burning condition in such a manner that the there serve es on under layer for the fresh el supplied to the second rate. Each grate is therefore supplied with incl but in such a manner that the fuel supplied to the second grete comes into contact with already bung or incandescent fuel supplied thereto from the first grate.

In this manner provision is made with certainty that the burning action on the second grate takes places so. in thereof.

arranment, however, has further advantages. irst it is not necessery to coin ediately at the beginsider the utilization of the fuel with which the ante-grate operates as everything which is not burnt thereon will certainly be burnt on the second grate.

Further, in connection with the ante-grate, it is not necessary to consider whether the gases developed thereon are immediately com letely consumed as these gases can be con ucted into the combustion chamber of the second grate and there burnt with certainty.

Two forms of construction in accordance of an inclined grate, consists for example,.

of anumber of steps arranged side by side "which in theknown manner, are reciprocated on their roller bearings by a shaft 5 provided with eccentrics. At a short distance above incandescent fuel from the to c is located the so-called ante gret which is in the form of s stationery steppe or inclined grate 5. At its lower end at late 6 is supported on roller bearings f. The plate o is in the dorm of a grate so that ashes reechside, and moved relatively in the known more nor. The separate parts of the plate e are then connected to the correspondingsteps of the grate a, If than 2. step of the a moves to the left, therefore rearwercly, the corresponding part of the plate e moves to the right, i. e. forwardly, so that the fuel Zialh ing over the front edge of the part of the plate c in uestion, will reach the corresponding step 0 the grate a with certainty. If the ante-grate d is so constructed thet its lower end extends suitably beyond the upper end of the grate athen the intermediate plate 6 may be omitted entirely. In this case the ante-grate (2' may then be constructed of separate relatively reciprocating steps in a similar manner to the main grate (z and then the etc s of the two grates may be connected toget er in such a manner that they may be reciprocated from a single point of operation, for example, by the eccentric shaft b, shown in Fig. 1.

The coal hopper I: has its lower end formed with two discharge pipes so that the pipe supplies coal to the main grate a and the pipe k supplies fuel to the grate d. The coal supplied by the pipe 70 passes on to the grate a after this has been covered with a la er of the grate d y the plate e. I

The construction described enables the ante-grate d to operate as a high power grate without considering its ciiiciency, as the combustion gases generatedthereon, even if they do not enter into combustion immediately, will enter into complete combustion in the main combustion chamber above the second p I grate a, for which purpose the main grate a be operated with a predetermined excess of air. In the form of construction according to Fig. 1 generated on the ante-grate d and w ich are not burnt immediately gass throufig e lateral t m, shown y broken into the chain r 0, which is only n at the bottom, into the combustion cham r into which enter from belowthehotgasesfromthemaingratea. lhe firing o ration can therefore be ad- Justed from e start with advan in such a manner that less CO, but mai y CO, is produced on the antete 4.

Many kinds of coal ave the disadvantage that the coal, at too high a temperature of firing readil fuses together on the surface sothat here rge clinkers areformed which are impervious to air and thus hindercombustion; such clinker formation is also delerterious because the parts which have fused together, if they pass from the ante te to the main grate under the layer of fue thereon obstruct the supply of. air. 7 y a such undesirable actions are slim ted by the form of construction according Figs.

both

2 and 8.

W 9f the p m, 1008 y sides of the firing as own in Fig.1, which connect the firing ace of the ante-grate d thatil of tlhee mafm-gate a or with {a ustionc am ro or ringgases rovi in t the brickwork in front of t liehantegrate is broken away, i. e. a larger or smaller part thereofis removed. In this manner the gases generated on the ante= have direct admimion to the combustion chamber. In this connection it is rticularly taut that the brickwork m which a d1 heat radiation to the ante-grate takes lace, which particularly assists in the c ier for Fnation abov; referrid t), is eliminated.

passage ormed awa the brickwork may be rozided wi cozli pipes and then it is pomible, a h' wer ante-grate, to keep the temperature in the combustion chamber of the ante-grate at a 'ble value, and the electiren'em of th 1a arrangement may be increased by the plxfllltll of a 1%" pmlllzie draft.d ocordmg' to igs. 2 '8 a wi e a connects the combustion chamber; of the ante-grate d with the tiring chamber of the maingratea'orwiththe chamberoofthelatterinwhichtheymixatiiig combudlouchamhentermmate d n plpupexten uwa rrandthecha inberr ahigherlevelthanthechamber the generatedinthepipes is-thusconawa,a'ndthereturn whichhaa evaporatedthroughthe 'tionofthebedoffuelismateriall of water pipes to the chamber g is facilitated. The supply of cooling water takes place through the pipe t to the chamber q, whilst the steam which is generated is conducted away by the pi u. I I he coal for the mam grate passes from the hopper k through the branch pipes 1) into the lateral pass is, from here it passes through the openm w from both sides onto the main grate a. e coal from the hopper 1 passes to the ante-grate d through the branch ipe k.

Sho d the action of the cooling ipes p be insuficient cooling pipes may also pro,- vided at the sides a: (Fig. 3) of the passage n. In some forms of construction it may under circumstances, not be necessary-to conduct the cooling pipes p so close to the ante-grate d as shown in Fi 2 it may be suflicient to limit the length of e cooling pipes p to that of the passage n. The invention, however, does not depend on such details, they are determined by the preva' conditions With 'an ante-grate o a type hitherto known, a cooling action, as obtained by the pipes p, would be disadvantageous as it revents combustion of the .tion being hindered by the cooling actionpn the burn' layer. In the new. construction described ifie reverse is the case as here it does not depend on complete combustion on the ante-grate but on the fact of loading the ante-grate as much as possible in order thus to suitably increase the efliciency of the entire tiring the com us- Y It may be observed that the o ration of p the grate is materially improv and more uniform consumption of fuel is obtained when the fuel is sup ied to the sides of the te. It is found at when the fuel .is defi v ered acres the entire width of the grate, the reciprocation of the grate parts results in the distribution of fuel to a uniform de th over the entire width of the grate. us as the fuel moves through the furnace, the action of the highly heated incandescent walls of the side of e grate results in rapid consumption of the fuel disposed adjacent thereto, and thus the draft through the denser porreduced. When fuel is delivered to the si es of the grate, a suficient layer of fuel is present, even at the'discha ofthe ,to ensure uniform combustion,- this being a feature of the the ante-grate d, it is preferably operated draft, as is well known; if 'maln grate a and the ante-grate d, therefore both, are operated with low p dflzft ttloien a presure is used for an grate or the main grate. 1

I claim 1. a main inclined grate,

- fuel thereto, means for supplying both grates, so as to form a burning layer on the main grate on which fresh fuel is supplied, a combustion chamber for said secondary grate, a combustion chamber for said main grate, brickwork in which said grates ere located, said brickwork having a passage formed therein, said passage forming a means of communication between said oombustion chbem, and cooling pipes located said pamage to retard combustion in the chamber for the secondary grate.

2. In eembinafion a main inclined grate, secondary inclined grate arra ed above the grate, means for supp'ying fuel to both grates, the secondary grate supplying incandescent burning fuel to the main grate, so es to form a burning layer thereon on which fresh fuel is sup lied, a combustion chamber for said second bastion chamber for said main grate, brickwork in which said grates are located, said brickwork having a passage formed therein,

said a :iorming a means of communication etween said combustion chambers, and coohng pipes located in said passa said,

cooling pipes extending into the com ustion.

chamber of said secondary grate to retard combion therein, means for supplying cooling weter to said, cooling pipes, means for conducting steam from said cooling p p a wtween sci cooling pipes.

3, In combination a main inclined grate, a secondary inclined grate arranged above the main grate, means for-supplying fuel to Whichfreshfuelis passages forming we tea, the secondary'grate supplying incent burning fuel to the main grate, so as to form a burning layer thereon on sugplied, a combustion chamber for said secon ary grate, a combustion chamber for said main grate, brickwork in which said grates are located, said brickwork having a passage formed-therein, said a means of communication between said combustion chambers, and cooling pipes'iocated in said passage to retard combustion in the chamber for theseoondary grate, a chamber to which said cooling pi are connected at one end, a second chain r to which said cooling pipes are connected at the other end, said second chamber being at a higher level than the first chamber, ipes ary grate, a comgipes forforming a return flow and means of communication between said 1 combustion chambers.

' LEBRECHT STEINMULLER.

between said chamber, means. for supp ymg water to the first chamber, and means for conducting steam from the second chamber. 4. In combination a main inclined grate,

a. secondary inclined grate arranged above the main grate, means for supplying fuel to the secondary grate and to the side! only of the main te, the secondary grate supplying incan escent burning fuel to the mam ice 

